term% cat index.txt PKON(2) System Calls Manual PKON(2)
NAME
pkon, pkoff - establish packet protocol
SYNOPSIS
pkon(fd, size)
pkoff(fd)
DESCRIPTION
Pkon establishes packet protocol (see pk(4)) on the open character spe‐
cial file whose file descriptor is fd. Size is a desired packet size,
a power of 2 in the range 32≤size≤4096. The size is negotiated with a
remote packet driver, and a possibly smaller actual packet size is re‐
turned.
An asynchronous line used for packet communication should be in raw
mode; see tty(4).
Pkoff turns off the packet driver on the channel whose file descriptor
is fd.
SEE ALSO
pk(4), pkopen(3), tty(4), signal(2)
DIAGNOSTICS
Pkon returns -1 if fd does not describe an open file, or if packet com‐
munication cannot be established.
Pkoff returns -1 for an unknown file descriptor.
Writing on a packet driver link that has been shut down by close or
pkoff at the other end raises signal SIGPIPE in the writing process.
PKON(2)